Which packaging innovation, introduced in the 1930s but popularized in the 1950s-60s, revolutionized the book industry by making literature more affordable and accessible to mass markets?

The publishing industry has seen numerous innovations in packaging design that have dramatically influenced how readers interact with and purchase books. One particular packaging revolution in the late 20th century fundamentally changed the economics of the book industry, making literature more accessible to millions. Test your knowledge about this significant milestone in book retail history and how it reshaped the literary marketplace.

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Mass market paperbacks with pulp paper covers
Hardcover books with removable dust jackets
Leather-bound collector's editions with gold leaf pages
Spiral-bound notebooks with tear-away pages